ICERI ICERI 2019 Proceedings : [elektronický zdroj] : 12th International Conference of Education, Research and Innovation : Seville (Spain) 11-13 November 2019. -- 1. vyd. -- Seville : IATED Academy, 2019. -- USB. -- ISBN : 978-84-09-14755-7. -- ISSN : 2340-1095.